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  2. Small-angle approximation - Wikipedia

    en.wikipedia.org/wiki/Small-angle_approximation

    For a small angle, H and A are almost the same length, and therefore cos θ is nearly 1. The segment d (in red to the right) is the difference between the lengths of the hypotenuse, H, and the adjacent side, A, and has length , which for small angles is approximately equal to /.

  3. Logistic map - Wikipedia

    en.wikipedia.org/wiki/Logistic_map

    The usual values of interest for the parameter r are those in the interval [0, 4], so that x n remains bounded on [0, 1]. The r = 4 case of the logistic map is a nonlinear transformation of both the bit-shift map and the μ = 2 case of the tent map. If r > 4, this leads to negative population sizes.

  4. Posterior probability - Wikipedia

    en.wikipedia.org/wiki/Posterior_probability

    The posterior probability is a type of conditional probability that results from updating the prior probability with information summarized by the likelihood via an application of Bayes' rule. [1]

  5. Covariance - Wikipedia

    en.wikipedia.org/wiki/Covariance

    Each cuboid is the axis-aligned bounding box of its point (x, y, f (x, y)), and the X and Y means (magenta point). The covariance is the sum of the volumes of the cuboids in the 1st and 3rd quadrants (red) and in the 2nd and 4th (blue).

  6. Bessel function - Wikipedia

    en.wikipedia.org/wiki/Bessel_function

    n (x) with n = −0.5 in the complex plane from −2 − 2i to 2 + 2i Plot of the Hankel function of the second kind H (2) n (x) with n = −0.5 in the complex plane from −2 − 2i to 2 + 2i. Another important formulation of the two linearly independent solutions to Bessel's equation are the Hankel functions of the first and second kind, H (1 ...

  7. Imaginary unit - Wikipedia

    en.wikipedia.org/wiki/Imaginary_unit

    The imaginary unit or unit imaginary number (i) is a mathematical constant that is a solution to the quadratic equation x 2 + 1 = 0. Although there is no real number with this property, i can be used to extend the real numbers to what are called complex numbers, using addition and multiplication. A simple example of the use of i in a complex ...

  8. Cartesian product - Wikipedia

    en.wikipedia.org/wiki/Cartesian_product

    An example of this is R 3 = R × R × R, with R again the set of real numbers, [1] and more generally R n. The n-ary Cartesian power of a set X is isomorphic to the space of functions from an n-element set to X. As a special case, the 0-ary Cartesian power of X may be taken to be a singleton set, corresponding to the empty function with codomain X.

  9. Partial fraction decomposition - Wikipedia

    en.wikipedia.org/wiki/Partial_fraction_decomposition

    In algebra, the partial fraction decomposition or partial fraction expansion of a rational fraction (that is, a fraction such that the numerator and the denominator are both polynomials) is an operation that consists of expressing the fraction as a sum of a polynomial (possibly zero) and one or several fractions with a simpler denominator.